java写一个socket server端代码

下面是一个简单的Java Socket Server端代码示例：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketServer {
    public static void main(String[] args) throws IOException {
        // 创建一个ServerSocket对象，监听指定端口号
        int port = 8888;
        ServerSocket serverSocket = new ServerSocket(port);
        System.out.println("Server started on port " + port);

        // 循环监听客户端连接
        while (true) {
            Socket socket = serverSocket.accept();
            System.out.println("Client connected: " + socket.getInetAddress().getHostAddress());

            // 处理客户端请求
            new Thread(() -> {
                try {
                    InputStream inputStream = socket.getInputStream();
                    OutputStream outputStream = socket.getOutputStream();

                    // 读取客户端发送的数据
                    byte[] buffer = new byte[1024];
                    int length = inputStream.read(buffer);
                    String request = new String(buffer, 0, length);
                    System.out.println("Client request: " + request);

                    // 向客户端发送响应数据
                    String response = "Hello, client!";
                    outputStream.write(response.getBytes());
                    outputStream.flush();

                    // 关闭流和连接
                    inputStream.close();
                    outputStream.close();
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }
}

该代码通过创建一个ServerSocket对象监听指定端口，然后通过循环监听客户端的连接，处理客户端请求，最后关闭连接。在处理客户端请求时，使用了多线程的方式，可以同时处理多个客户端的请求。